input_common: Create input poller and mapping

src/input_common/input_mapping.h

@@ -0,0 +1,76 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included
+
+#pragma once
+#include "common/threadsafe_queue.h"
+
+namespace InputCommon {
+class InputEngine;
+struct MappingData;
+
+class MappingFactory {
+public:
+    MappingFactory();
+
+    /**
+     * Resets all varables to beggin the mapping process
+     * @param "type": type of input desired to be returned
+     */
+    void BeginMapping(Polling::InputType type);
+
+    /// Returns an input event with mapping information from the input_queue
+    [[nodiscard]] const Common::ParamPackage GetNextInput();
+
+    /**
+     * Registers mapping input data from the driver
+     * @param "data": An struct containing all the information needed to create a proper
+     * ParamPackage
+     */
+    void RegisterInput(const MappingData& data);
+
+    /// Stop polling from all backends
+    void StopMapping();
+
+private:
+    /**
+     * If provided data satisfies the requeriments it will push an element to the input_queue
+     * Supported input:
+     *     - Button: Creates a basic button ParamPackage
+     *     - HatButton: Creates a basic hat button ParamPackage
+     *     - Analog: Creates a basic analog ParamPackage
+     * @param "data": An struct containing all the information needed to create a proper
+     * ParamPackage
+     */
+    void RegisterButton(const MappingData& data);
+
+    /**
+     * If provided data satisfies the requeriments it will push an element to the input_queue
+     * Supported input:
+     *     - Button, HatButton: Pass the data to RegisterButton
+     *     - Analog: Stores the first axis and on the second axis creates a basic stick ParamPackage
+     * @param "data": An struct containing all the information needed to create a proper
+     * ParamPackage
+     */
+    void RegisterStick(const MappingData& data);
+
+    /**
+     * If provided data satisfies the requeriments it will push an element to the input_queue
+     * Supported input:
+     *     - Button, HatButton: Pass the data to RegisterButton
+     *     - Analog: Stores the first two axis and on the third axis creates a basic Motion
+     * ParamPackage
+     *     - Motion: Creates a basic Motion ParamPackage
+     * @param "data": An struct containing all the information needed to create a proper
+     * ParamPackage
+     */
+    void RegisterMotion(const MappingData& data);
+
+    Common::SPSCQueue<Common::ParamPackage> input_queue;
+    Polling::InputType input_type{Polling::InputType::None};
+    bool is_enabled{};
+    int first_axis = -1;
+    int second_axis = -1;
+};
+
+} // namespace InputCommon